Just to be clear... It sounds like the op is talking about tap and pay, which is one of many features of google wallet. Subsequent answers seem to be making the assumption that google wallet IS tap and pay, which is patently untrue. Google wallet works fabulously on old non-NFC iphones for example... Its just that the tap and pay feature doesnt.
In answer to whether gw tap and pay works on the n6, it works fine. But beware if you are into custom roms... Last i looked, there were no AOSP roms besides stock google, in which tap and pay works without kludgey workarounds if at all.
My att n6 is rooted but othwise stock and i used gw tap and pay in the verizon store to buy something for my brother, and in the tmobile store to buy something for my wife.
I used gw tap and pay at CVS and Walgreen's a few months ago on my 4.4.2 note 2 and it worked fine. But I've heard the drug stores are might be trying to do something that might block he tap and pay.
-Peter